also sea-coal, old name for "mineral coal" (as opposed to charcoal), mid-13c.; earlier, in Old English, it meant "jet," which chiefly was found washed ashore by the sea. The coal perhaps so called from resemblance to jet, or because it was first dug from beds exposed by wave erosion. From sea + coal. As it became the predominant type used, the prefix was dropped.
双语例句
1. Importing coal by sea is often easier and cheaper.
通过海路进口煤炭往往更容易,也更便宜.
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2. Will imported from Russia to China's coal, usually by rail or sea?
请问从俄罗斯进口到中国的煤碳, 一般是通过铁路还是海运?
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3. As a result, Yuxian known as sea of coal iron Township.
因此, 盂县素有“煤海铁乡”之称.
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4. The coal - rich Shanxi Province in order to have a sea of coal.
山西以盛产煤而有“煤海”之称.
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5. The air - lift vertical pipes is frequently encountered in deep - sea mining, hydraulic coal - mining and river sludge removing.